package jjn.acwing;

import java.util.Scanner;

/**
 * @author Jiang Jining
 * @since 2023-07-22 22:07
 */
public class Acwing612 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int i = scanner.nextInt();
        System.out.printf("VOLUME = %.3f", 4.0 / 3 * i * i * i * 3.14159);
    }
}
